Use Doxygen-style comments.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@50833 91177308-0d34-0410-b5e6-96231b3b80d8

tools/llvmc2/llvmc.cpp

@@ -48,6 +48,7 @@ cl::opt<bool> ViewGraph("view-graph",
                          cl::Hidden);
 
 namespace {
+  /// BuildTargets - A small wrapper for CompilationGraph::Build.
   int BuildTargets(CompilationGraph& graph) {
     int ret;
     sys::Path tempDir(sys::Path::GetTemporaryDirectory());